Florence Fu/Tech Insider Apple's new operating system for Mac, macOS Sierra, launches this fall as a free download for most users.

If you want to try it early, you can get the public beta now and test all the new Sierra features immediately. Warning! You'll likely encounter some bugs, so I don't recommend installing Sierra on your primary Mac.

So what's changing? Check out the most important Sierra features below.

1/

Files on desktop now sync to iCloud.

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That means desktop files will appear on all devices you're logged into, including Macs, iPhones, and iPads.

2/

See? That photo of LeBron I saved to the desktop immediately appeared on the iCloud Drive iPhone app.

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3/

The Photos app can scan your library and help you find photos easier using image recognition.

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For example, search "cat" and get all your cat photos.

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The app will also group photos into albums automatically based on location and the people in them. Click on the Memories tab to view.

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Apple does all its image recognition on your device and doesn't store your data on its servers.

It'll remove files like iTunes videos and other large items and store them in iCloud. You can download them again later.

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Apple says this will save several gigabytes of space for many users.

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You can play videos in a picture-in-picture window on your desktop. It works with web videos and iTunes. Click the the special icon on the video player...

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8/

...and the video pops into a separate window.

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9/

You can resize and move the video around too.

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This feature only works with web videos you watch in Safari. You can't use it with Chrome or Firefox. So far, only ESPN and Vimeo have enabled picture-in-picture video, but there's nothing stopping YouTube and others from adding it too.

10/

You can run multiple tabs in many apps, just like you can in a web browser.

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Apple says most app developers won't have to change their code to use this feature. It'll happen automatically in Sierra.

11/

iMessage on Mac is getting a lot of new features, just like it is in iOS 10. For example, emojis are three times larger. You can also react to messages with stickers.

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12/

Apple Music has a new design in iTunes.

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It has big, bold fonts and art.

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The rest of iTunes pretty much looks the same as before, unfortunately. iTunes is long overdue for a redesign.

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The notifications window has a new look. Widgets now appear in the Today tab, and you can customize them as you see fit.

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15/

But this is the biggest change: Siri is now on the Mac. You can do a lot with it, like search for images.

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You open Siri from the icon in the dock or the taskbar.

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You can also drag content from the Siri window into other apps.

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Siri is a quick way to search for files on your computer.

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Here's the result when you ask for audio files, but you can search for documents, photos, and everything else.

18/

Siri can search Twitter.

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And sports scores.

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And tell you the weather.

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That's not all, of course. Searches are pretty much the same as they are on the iPhone.

21/

It's an easy way to find emails buried in your inbox.

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But sending messages or emails with your voice isn't much easier than just typing them the old-fashioned way.

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23/

Siri can handle basic Mac settings, like screen brightness.

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Or WiFi.

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This is a useful way to find settings that are buried in a lot of menus.

So is Sierra any good?

AP

It's still early, but Sierra seems like a nice update. Siri hasn't changed the way I use my computer, but it's definitely useful when I need to search for files or messages. All the other new Sierra features are relatively minor improvements, but they're all worth the update.